Full-Stack Developer 面试题与答案
问题 21. What is the purpose of the 'use strict' statement in JavaScript?
The 'use strict' statement enables strict mode in JavaScript, catching common coding errors and preventing the use of certain error-prone features.
问题 22. Explain the concept of XSS (Cross-Site Scripting) and how to prevent it.
XSS is a security vulnerability that allows attackers to inject malicious scripts into web pages viewed by other users. Prevention methods include input validation and output encoding.
问题 23. What is the significance of the 'this' keyword in JavaScript?
In JavaScript, 'this' refers to the current execution context. Its value depends on how a function is called and is often used within object methods.
问题 24. Explain the concept of JWT (JSON Web Token) and its use in authentication.
JWT is a compact, URL-safe means of representing claims to be transferred between two parties. It is commonly used for authentication by securely transmitting information between parties.
问题 25. What is the purpose of the HTTP protocol in web development?
HTTP (Hypertext Transfer Protocol) is the foundation of data communication on the web. It defines how messages are formatted and transmitted, enabling the exchange of information between a client and a server.
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